No Achievements Unlocking in Xbox Pc Beta

Achievements are connected to your XBL account not your console, any Xbox console achievement you unlock on one console will be unlocked on another too. But like you mentioned about being able to unlock other achievements on Windows / Xbox Beta PC, some
games can get achievements on differing platforms. An easy way to find out which games can do this is to sign up to
True Achievements

Achievements will only unlock if you are connected to Xbox Live, and if the games support them. It has got nothing to do with the Xbox PC beta app.

Sometimes achievements do not unlock for different reasons. Usually it's to do with the servers having issues. The best thing to do is wait up to 72 hours, and if they donot unlock during that times, then contacting Xbox support would be the best option.
support.xbox.com/contact-us

I believe Achievements on PC are still in Beta, so some might unlock while others will stay locked and will probably retroactively unlock once the game and client is patched. I would just continue enjoying the game, the achievement will appear soon enough.

Are you connected to the Internet?

We really shouldn't have to do stuff like this to fairly unlock achievements. This isn't some beta PC version! Thanks for the tips; I'll try them but it really shouldn't be this difficult.